title: Efficient removal of aromatic sulfonates from wastewater by a recyclable polymer: 2-naphthalene sulfonate as a representative pollutant.
abstract: As a family of hydrophobic ionizable organic compounds, aromatic sulfonates can be present at high levels in industrial wastewaters. They tend to exist as anions over a wide range of pH and cannot be effectively trapped by conventional adsorbents. In the current study, a recyclable acrylic ester polymer (NDA-801) was synthesized for effective removal of aromatic sulfonates from wastewater of high acidity (e.g., pH < 1) and inorganic salts (e.g., approximately 5-10% Na2SO4 in mass), for which sodium 2-naphthalene sulfonate (2-NS) was chosen as a representative target contaminant 2-NS uptake onto NDA-801 increased with the increasing acidity of the solution. The zeta potential of NDA-801 measured at different pH levels as well as batch 2-NS adsorption from methanol/water binary systems demonstrated the favorable roles of electrostatic and hydrophobic interaction in 2-NS adsorption. As compared to a granular activated carbon GAC-1, NDA-801 exhibited much higher removal efficiency and capacity of 2-NS in fixed-bed adsorption. Moreover, the exhausted NDA-801 beads by 2-NS can be completely regenerated by water wash for repeated use, which is more economically desirable than by other regenerants, such as NaOH solution. Continuous column adsorption-regeneration cycles indicated negligible capacity loss of NDA-801 during operation and further validated its feasibility for potential application in associated wastewater treatment.
authors.affiliation: State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing 210093, PR China.
authors.forename: Bingjun
authors.initials: B
authors.lastname: Pan
authors.forename: Weiming
authors.initials: W
authors.lastname: Zhang
authors.forename: Bingcai
authors.initials: B
authors.lastname: Pan
authors.forename: Hui
authors.initials: H
authors.lastname: Qiu
authors.forename: Qingrui
authors.initials: Q
authors.lastname: Zhang
authors.forename: Quanxing
authors.initials: Q
authors.lastname: Zhang
authors.forename: Shourong
authors.initials: S
authors.lastname: Zheng
mesh_terms: D000042:Absorption; D000327:Adsorption; D003247:Conservation of Natural Resources; D004952:Esters; D006841:Hydrocarbons, Aromatic / Q000302:isolation & purification*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D009282:Naphthalenesulfonates / Q000302:isolation & purification*; D011108:Polymers / Q000737:chemistry*; D012996:Solutions; D013431:Sulfates / Q000737:chemistry; D013696:Temperature; D013816:Thermodynamics; D014865:Waste Disposal, Fluid; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D018508:Water Purification
chemical_list: D004952:Esters; D006841:Hydrocarbons, Aromatic; D009282:Naphthalenesulfonates; D011108:Polymers; D012996:Solutions; D013431:Sulfates; D014874:Water Pollutants, Chemical; C012036:sodium sulfate; C534215:2-naphthalenesulfonic acid